Method of making abrasive wiper pad



1958 c. R. KOLZOW ETAL METHOD OF MAKING ABRASIVE WIPER PAD Filed June 29. 1955 United Sltates Patent METHOD OF MAKING ABRASIVE WIPER PAD Clarence R. Kolzow, Elmhurst, and William Yonkmau, Chicago, Ill., assignors to Western Electric Company, licolzporated, New York, N. Y., a corporation of New Application June 29, 1955, Serial No. 518,752 1 Claim. (Cl. 117-27) This invention relates to methods of making abrasive articles and more particularly to methods of making abrasive wiper pads.

An object of this invention is to provide a method of making abrasive wiper pads in which the abrasive is evenly distributed on individual filaments of the fabric of the wiper pads along the wiping surface.

In a method illustrating features of the invention a wet mixture of abrasive and glue is sprayed in a fine mist onto a plurality of wiper pads secured in a clamping device. After the wiper pads are dry they are flexed by rollers to render them flexible and to remove any clusters of glue-abrasive.

A complete understanding of the invention may be obtained from the following detailed description of a method forming a specific embodiment thereof, when read in conjunction with the appended drawing, in which,

Fig. 1 is an elevational view showing the spraying operation;

Fig. 2 shows a finished wiper pad; and,

Fig 3 is an enlarged fragmentary section taken on line 33 of Fig. 2 showing the manner in which the abrasive is distributed on the filaments of the fabric.

Referring now in detail to the drawing, a plurality of wiper pads 11 are shown secured in a clamping device 12. Each wiper pad includes a holding clip 13 and a fabric 14, and is designed for use in panel dial telephone exchanges. An abrasive mixture consisting of a mixture of 25 grams of urea formaldehyde and 15 cc. of water thoroughly mixed with a mixture of 30 grams of 600 mesh silicon carbide and 15 cc. of water is then applied to the wiper pads 11 through a nozzle 16 of an air type spraying device of a well known type (not shown) to individually coat each filament 17 of the fabric of the wiper pads for a substantial distance from the end thereof along the wiping surface. The pads 11 then are dried either in a drier or in the air. After this mixture has dried on the wiper pads 11, a roller 18 is passed over them to render each filament 17 of the wiper pad fabric flexible and to insure that the silicon carbide is not matted,

but is evenly distributed along the filaments 17 as shown in Fig. 3.

The mixture is sprayed on the filaments 17 in sufficient quantity per unit area that substantially the entire length of each filament is coated from the outer end thereof. The rolling or pummelling of the pads is sufiicient to break substantially every filament 17 loose from the others, whenever the adhesive binds any of the filaments to another. A fabric lacquered on one side and having nylon flocked pile on the other side is suitable for use in the wiper pads. The flocking is in the order of 12 ounces per square yard of fabric. The flexing of the pads also serves to break loose any particles of the abrasive mixture which are poorly bonded to the pad so that such particles will not contaminate the apparatus with which the pads are used.

The above-described method produces wiper pads having flexible abrasive-covered filaments or bristles which are separated from each other, and which have the powdered abrasive distributed evenly along substantially the full length of each filament. Hence, the pads are essentially soft in their Wiping action and also have the abrasive qualities needed.

It is to be understood that the above-described arrangements are simply illustrative of the application of the principles of this invention. Numerous other arrangements may be readily devised by those skilled in the art which will embody the principles of the invention and fall within the spirit and scope thereof.

What is claimed is:

The method of making abrasive wiper pads, comprising loading an elongated folded pile fabric into a clip to form a continuous exposed surface of pile along the line of fold of the fabric, clamping a plurality of said clips to force the fabrics together, spraying a wet mixture of abrasive and adhesive onto the pile along the exposed surfaces of the folds of the fabrics to coat substantially the entire length of the pile filaments at the folds of the fabrics, drying the coated fabrics, and rolling the clamped fabrics with aroller at the folds of the fabrics to separate substantially all the coated pile filaments from each other and to remove any excess loose abrasive.

References Cited in the file of this patent UNITED STATES PATENTS 1,161,497 Manley Nov. 23, 1915 1,764,928 Biddle June 17, 1930 1,833,715 Klingspor Nov. 24, 1931 1,850,413 Porte Mar. 22, 1932 1,993,821 Benner et al Mar. 12, 1935 2,185,746 Goencz Ian. 2, 1940 2,347,244 Colt et al. Apr. 25, 1944 

